Countersinks and Counterbores

[@alexshaykevich509]

Excellent explanation. Thank you.

[@harryhopkins7798]

Thank you. I really enjoy your discussions on the basics like this.

[@GaryH-pw9cm]

I have looked for a tool to cut a round slot for small O rings for 1/8 inch holes in a flange. I have not found any tools for small O rings only large ones, so I made one for use in aluminum out of steel fuel line by cutting slots in the end to act like blades and epoxied it to a 1/8 inch drill bit. It is slow but it does work. Also I have been looking for a tool to cut an annular groove inside a 3/8 hole in an aluminum casting. The need for this annular groove is to operate a spool valve so as to take the side load off the spool valve under pressure. I have not found one so I made my own tool from a cut down Dremel cutting tool works great. Needed a drill .372 inch to make a bore in an aluminum casting for a .371 spool valve. Again I could not find one but at a yard sale for a dollar I bought an old cheap letter size drill set made in India and The U size drill was not the correct size .3680 but was actually .372 just what I needed to make the bore in the casting for the spool valve. Sometimes things just work out and sometimes they don't. 😊

[@felixf5211]

As for cleaning things like disintegrating foam and anything sticky, take a look at a product called Rapid Remover. It's an industrial product originally made for the adhesives industry. Removes anything sticky within seconds. At one time it could only be had in a gallon or more, but now 32oz bottles can be purchased on Amazon. It's not terribly inexpensive, but a reference grade product. It's used in many applications. Have some tar stuck to your car? No problem. Took off a sticker and some of it was left behind? Less than a minute to remove. Edit: Almost forgot. If you buy NOS tooling that's stained with dry Cramolin, this stuff with a brass brush brings back a bright finish.

[@ypaulbrown]

well done

[@peirob]

Excellent again. Thanks

[@marcmckenzie5110]

Stuart, you're on quite a roll! One thing you didn't cover is the difference between boring, bore-ing, and boar-ing - it would fit well in your series!

[@TomChame]

Great series, thanks.

[@RustyInventions-wz6ir]

Interesting. Nice video

[@TheAyrCaveShop]

Thanks Stuart !!

[@jordanwallace5866]

Why do they sell 6 flute countersinks as chatterless if you say they chatter more?

[@StuartdeHaro]

Marketing I guess, but the proof is definitely in the pudding. They scream like a banshee if you even imagine running them too fast and the countersink will look like it was chewed in by rabid squirrels.

[@MrsMcMuffin]

In my experience they work pretty good on the lathe and much more smoothly than 3 flute ones. 3 flute start to jump around once the cut gets deeper, especially on a small machine. At least that's what I noticed so far.

[@felixf5211]

Great question! My first countersink was a 6-flute "chatterless," which chattered like crazy. Thought there was something wrong with my setup; the machine could have been more rigid. Then tried a Weldon zero-flute. It was like a different world.

[@gasparini76]

I normally use brake cleaner. If is not the right approach, then the next option is to use a ultrasonic cleaner

[@wktodd]

acetone will usually remove most sticky stuff

[@aceroadholder2185]

I usually try Naphtha first before using Acetone. Naphtha has the advantage of generally not attacking paint or part markings. Cheers from NC/USA

[@zugi]

Thank you, great info. Just please, for the future, watch about audio (distance between your mouth and microphone) because there is a loooot of 'ts' sounds that just killing microphone and my ears.

[@StuartdeHaro]

I've made some improvements over the years as I've learned how to make videos. Hopefully my more recent videos are less abrasive to the senses.

[@jean-francoisgrenier4947]

yep...ultrasonic with heat

[@jackdaniels7913]

Rubbing alcohol if you can find it gas if you can drip them in a sized container one piece at a time and shake tell clean then oil with your favorite libation 😉😉 replace foam with better foam, wood, or in most of my cases pappertowl/shop rag whatevers closer at hand wen I get to that step 🥴 🥃cheers🍻

[@stanmarsh2499]

4 years too late but harbor freight sells a cheap ultrasonic cleaner that’ll clean those c’bores.

[@StuartdeHaro]

@@stanmarsh2499 It’s never too late to comment on a video.

[@nrml76]

ultrasonic cleaner in a kerosene bath.

[@jagboy69]

Thanks for that! I have an ultrasonic cleaner and was considering putting some kerosene in it. Now I know I won't blow up.

[@michaell397]

goof off/ Goo be gone and non abrasive scotch bright or 3-m pad.

[@David-Rule]

Oh Oh Oh! Burn the foam out.

[@chbengtan7266]

Too much talking, no demonstration at all.